alleryStart learning →A leaves P at 3 km/h. B follows 1 h later at 5 km/h. Same route, steady speeds, no stops. B's walking time to catch A?
A1 hour
B2½ hours
C2 hours
D1½ hours
Answer & Solution
Correct answer: D. 1½ hours
Let t hours elapse after B starts. A has walked for t+1 hours, so 3(t+1)=5t. Hence 3=2t and t=1.5 hours. Both start from the same point and follow the same route.
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